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NX bit and a.out
It looks like the recent patches to enable the NX bit on Xen ports has
broken a.out binaries.
I confirmed that forcing PG_NX to 0 in sys/arch/i386/include/pte.h allows
a.out programs to work.
Here is a ktrace from a small program.
1028 0 ktrace EMUL "netbsd"
1028 0 ktrace RET ktrace 0
1028 0 ktrace CALL execve(0xbf7fe928,0xbf7fee00,0xbf7fee08)
1028 0 ktrace NAMI "/usr/local/sbin/mpage.old"
1028 0 ktrace RET execve -1 errno 2 No such file or directory
1028 0 ktrace CALL execve(0xbf7fe928,0xbf7fee00,0xbf7fee08)
1028 0 ktrace NAMI "/usr/local/bin/mpage.old"
1028 0 mpage.old EMUL "netbsd"
1028 0 mpage.old RET syscall JUSTRETURN
1028 0 mpage.old CALL open(0x10ab,0,0)
1028 0 mpage.old NAMI "/usr/libexec/ld.so"
1028 0 mpage.old RET open 3
1028 0 mpage.old CALL read(3,0xbf7ffe44,0x20)
1028 0 mpage.old GIO fd 3 read 32 bytes
"\M-@\M^F\^A\v0円\M-P0円0円0円\^P0円0円\M-P0円0円0円0円0円0円0円 0円0円0円0円0円0円0円0円0円0円0円"
1028 0 mpage.old RET read 32/0x20
1028 0 mpage.old CALL mmap(0,0xe0d0,5,4,3,0,0,0)
1028 0 mpage.old RET mmap -1149304832/0xbb7f0000
1028 0 mpage.old CALL mmap(0xbb7fd000,0x1000,3,0x14,3,0,0xd000,0)
1028 0 mpage.old RET mmap -1149251584/0xbb7fd000
1028 0 mpage.old CALL mmap(0xbb7fe000,0xd0,3,0x1014,0xffffffff,0,0,0)
1028 0 mpage.old RET mmap -1149247488/0xbb7fe000
1028 0 mpage.old PSIG SIGSEGV SIG_DFL: code=SEGV_ACCERR,
addr=0xbb7fd0e8, trap=6)
1028 0 mpage.old NAMI "mpage.old.core"
Thanks.
--
- Brian
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